Hi,
Mirroless has some advantages, when properly done:
- Moving mirror is eliminated, thus a major source of vibration is wiped out.
- Focusing should be pinpoint accurate, as the sensor itself is used for focusing.
- Reaction times can be very fast.
But, proper sensor technology is needed for a well working mirrorless system. There are at least two key technologies that need to be implemented in the sensor:
- On sensor PDAF, is needed for focusing speed.PDAF locates correct focus and contrast detection refines it.
- Electronic First Shutter Curtain is needed on focal plane cameras. Available sensor technology does not support global shutter. With leaf shutter that may not be a great problem. But, without EFCS the shutter needs to close before exposure, which causes vibrations and significant delay. Releasing the shutter causes more vibrations. With EFCS the mechanical shutter just terminates exposure. Closure occurs at end of the exposure, so any vibration caused by the mechanical shutter affects only the last part of exposure.
The Fuji GFX has EFCS and the X1D has leaf shutter. Neither has PDAF, making focusing relatively slow.
This was demonstrated by the Sony A7R vs. the Sony A7rII. With the A7R Sony just slapped their high resolution sensor into the A7 body. That sensor had neither PDAF or EFCS. Lack of EFCS reduced resolution at medium shutter speeds to A7 levels and focusing on the A7r was slow.
The A7rII was clearly generation two. The new sensor has PDAF and AF-speed has been much improved. EFCS eliminates the vibration problem.
That is really saying that would Leica take the mirrorless route, they may need to wait until they have a good sensor. I understand that Panasonic is the major technology partner of Leica and I would presume that it is one of the reasons that Leica buys sensor from TowerJazz, which is a Panasonic company.
I would guess that the Leica S serves those users who are happy with it well. It is relatively compact for a MFD camera and it is weather proof.
I have just played with it for a few minutes, and it didn't klick for me, but I wouldn't be able to build an opinion about a camera using it a short time.
Being a slow photographer, I feel that if accurate focus is achieveable and the camera handles vibrations, it will probably be able of taking great images if paired with a good lens, a tripod and a good subject.
Regarding megapixels, I would suggest that the benefits of high resolution are that it will keep artefacts down. Now, the artefact that is far most noticeable is colour moiré. If wee don't see moiré and don't print large, increasing megapixels may be of little benefit. Just as an example, three years ago I started shooting with a 39 MP P45+ back. At my normal print size (A2) I couldn't see a benefit from the larger format and 39 vs. 24 MP. Colour moiré was a significant problem, though.
One may ask, why is moiré such a problem for me?
- I don't want it, it may be it does not show in prints, but I don't want it anyway.
- Subject matters do matter. I like shooting seashore, rippled water and sailboat rigs are about the worst offenders regarding moiré.
- I shoot quite carefully. Mostly tripod, focus using a loupe, use medium apertures, mirror lock up and a cable release. So I try to maximise image quality and that gives more conditions for aliasing.
Best regards
Erik
On the surface it would seem to be an argument against itself ... but that hasn't stopped anyone else, including Leica. Hasselblad went mirrorless and offers an adapter for HC/HCD SLR lenses. Sony went mirrorless and offered a couple of adapter choices for A mount DSLR/SLT lenses or Minolta SLR lenses. Leica went mirrorless 35mm with the SL and offers a R mount SLR to Mirrorless adapter, and a S adapter. Why would a mirrorless S camera be any different?
From a marketing perspective it introduces a new wave of buyers to spend hefty amounts of cash on new lenses while appeasing current S owners with adapters to eventually transition to mirrorless.
So, my bet would be a thinner more streamlined body and an adapter to use current S lenses.
- Marc